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Question

Molecular formula of chromite is:

A
FeCr2O4
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B
Fe2Cr3O4
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C
FeCrO3
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D
Cu2H2O
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Solution

The correct option is A FeCr2O4
The only commercially important ore of Cr is chromite, FeCr2O4.
Chromite has a spinel structure. In this structure the O atoms are arranged in a cubic close-packed lattice with FeII in one eighth of the available tetrahedral voids and CrIII in one quarter of the octahedral voids.

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